Mention GLCI pipeline runs on branches

[MichaelChirico]

Currently a quick read might imply the pipeline is only run on the nightly master pull. This minimal change should be enough to get unstuck in cases like #7102

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.69%. Comparing base (b19acf1) to head (631bfa0).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7103   +/-   ##
=======================================
  Coverage   98.69%   98.69%           
=======================================
  Files          79       79           
  Lines       14680    14680           
=======================================
  Hits        14489    14489           
  Misses        191      191           

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